Re: Unusual spam recently - hummm - postprocess

[Rick Moen <rick@linuxmafia.com>]

Quoting Bernd Eckenfels (ecki-news2004-05@lina.inka.de):

> If you relay mail  from your customers, you have to deliver them their
> bounces if they spam. 

Well, that's the trick, isn't it?  If they're sending spam (either
deliberately or -- much more likely of late -- because customer hosts have
been zombified by malware), then the sender addresses and (of late)
the envelope return path will almost certainly be forged.

It's possible you're taking that fact into account:  I'd be curious to
hear how you (or others) are ensuring that such bounces go somewhere
appropriate.